trans-4-tert.-Butylcyclohexanmethyl-methansulfonat | 36293-52-4

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 有机磺酸及其衍生物
• 英文名称: trans-4-tert.-Butylcyclohexanmethyl-methansulfonat
• CAS: 36293-52-4
• 化学式: C₁₂H₂₄O₃S
• 分子量: 248.387
• InChiKey: FBKPQBCFJUPNEF-XYPYZODXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.82
• 重原子数：
  16.0
• 可旋转键数：
  3.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  43.37
• 氢给体数：
  0.0
• 氢受体数：
  3.0

反应信息

• 作为反应物：
  描述：

  trans-4-tert.-Butylcyclohexanmethyl-methansulfonat 在 硫酸 、 水 、 sodium iodide 、 sodium hydroxide 作用下， 以 乙醇 、 N,N-二甲基甲酰胺 为溶剂， 生成 methyl trans-(4-t-butylcyclohexyl)acetate
  参考文献：
  名称：

  tert‐Butyl as a Functional Group: Non‐Directed Catalytic Hydroxylation of Sterically Congested Primary C−H Bonds

  摘要：

  The tert‐butyl group is a common aliphatic motif extensively employed to implement steric congestion and conformational rigidity in organic and organometallic molecules. Because of the combination of a high bond dissociation energy (~100 kcal mol−1) and limited accessibility, in the absence of directing groups, neither radical nor organometallic approaches are effective for the chemical modification of tert‐butyl C−H bonds. Herein we overcome these limits by employing a highly electrophilic manganese catalyst, [Mn(CF3bpeb)(OTf)2], that operates in the strong hydrogen bond donor solvent nonafluoro‐tert‐butyl alcohol (NFTBA) and catalytically activates hydrogen peroxide to generate a powerful manganese‐oxo species that effectively oxidizes tert‐butyl C−H bonds. Leveraging on the interplay of steric, electronic, medium and torsional effects, site‐selective and product chemoselective hydroxylation of the tert‐butyl group is accomplished with broad reaction scope, delivering primary alcohols as largely dominant products in preparative yields. Late‐stage hydroxylation at tert‐butyl sites is demonstrated on 6 densely functionalized molecules of pharmaceutical interest. This work uncovers a novel disconnection approach, harnessing tert‐butyl as a potential functional group in strategic synthetic planning for complex molecular architectures.

  DOI：

  10.1002/anie.202402858
• 作为产物：
  描述：

  trans-4-tert-Butylcyclohexanecarboxylic acid 在 lithium aluminium tetrahydride 、 硫酸 、 三乙胺 作用下， 以 乙醚 、 二氯甲烷 为溶剂， 反应 3.0h， 生成 trans-4-tert.-Butylcyclohexanmethyl-methansulfonat
  参考文献：
  名称：

  tert‐Butyl as a Functional Group: Non‐Directed Catalytic Hydroxylation of Sterically Congested Primary C−H Bonds

  摘要：

  The tert‐butyl group is a common aliphatic motif extensively employed to implement steric congestion and conformational rigidity in organic and organometallic molecules. Because of the combination of a high bond dissociation energy (~100 kcal mol−1) and limited accessibility, in the absence of directing groups, neither radical nor organometallic approaches are effective for the chemical modification of tert‐butyl C−H bonds. Herein we overcome these limits by employing a highly electrophilic manganese catalyst, [Mn(CF3bpeb)(OTf)2], that operates in the strong hydrogen bond donor solvent nonafluoro‐tert‐butyl alcohol (NFTBA) and catalytically activates hydrogen peroxide to generate a powerful manganese‐oxo species that effectively oxidizes tert‐butyl C−H bonds. Leveraging on the interplay of steric, electronic, medium and torsional effects, site‐selective and product chemoselective hydroxylation of the tert‐butyl group is accomplished with broad reaction scope, delivering primary alcohols as largely dominant products in preparative yields. Late‐stage hydroxylation at tert‐butyl sites is demonstrated on 6 densely functionalized molecules of pharmaceutical interest. This work uncovers a novel disconnection approach, harnessing tert‐butyl as a potential functional group in strategic synthetic planning for complex molecular architectures.

  DOI：

  10.1002/anie.202402858

文献信息

• Axial:Equatorial Rate Ratios. 1. Eliminations Leading to the Exocyclic Methylene Group
  作者：J. F. King、M. J. Coppen

  DOI：10.1139/v71-619

  日期：1971.11.15

  8. The rate difference found for the sulfoxides 4 and 6 is the first clear demonstration of steric acceleration (without any contribution from any reagent repulsion effect) in the formation of an exocyclic carbon–carbon double bond in a simple anchored cyclohexane System. The faster elimination from 7 (vs. 8) is ascribed primarily to steric acceleration; the experiment neither requires nor excludes

  苯基顺式-4-叔丁基环己烷甲基亚砜 (4) 在 116 度和 130° 下热解为 1-叔丁基-4-亚甲基环己烷 (5)，比其反式（赤道）差向异构体 6 快约 5 到 6 倍。cis-4-叔丁基环己烷甲基溴 (7) 在 100° 的叔丁醇中用叔丁醇钾进行消除，比其反式（赤道）差向异构体 8 快约 9 倍。亚砜 4 和 6 的速率差异是第一个在简单的锚定环己烷系统中形成环外碳 - 碳双键的空间加速（没有任何试剂排斥效应的任何贡献）的清晰证明。从 7（相对于 8）更快的消除主要归因于空间加速度；该实验既不需要也不排除基材和攻击基体之间非键合排斥的影响。